Question

While estimating the nitrogen present in an organic compound by Kjeldahl’s method, the ammonia evolved from 0.25g of the compound neutralized 2.5mL of 2M H2SO4. The percentage of nitrogen present in organic compound is ________

Answer 1

** ** NH3 gas is neutralized by 2⋅5mL of 2M H2SO4

∴ Moles of NH3 neutralized = $2⋅5 × 2 × 2$ millimole
= $10×10^{–3}$ moles

∴ Weight of N present in compound will be
= $10 × 10^{–3}\times14$
= 0⋅14g

% of ‘N’ in compound
=$\frac{0.14}{0.25}$×100=56%